ASTM D5637-05(2012)

Standard Test Method for Moisture Resistance of Electrical Insulating Varnishes

SIGNIFICANCE AND USE
This test method is useful for the evaluation of insulating varnish performance in high humidity exposure.
SCOPE
1.1 This test method covers the mechanical performance of electrical insulating varnishes subjected to high humidity conditions.  
1.2 The values stated in SI units are to be regarded as standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See 7.1.
Note 1—There is not ISO or IEC equivalent.

General Information

• Status: Historical
• Publication Date: 31-Dec-2011
• ICS: 29.035.60 - Varnished fabrics
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.01 - Electrical Insulating Products

Relations

• Replaces: ASTM D5637-05 - Standard Test Method for Moisture Resistance of Electrical Insulating Varnishes
• Effective Date: 01-Jan-2012
• Replaced By: ASTM D5637-05(2017) - Standard Test Method for Moisture Resistance of Electrical Insulating Varnishes
• Effective Date: 01-Nov-2017
• Referred By: ASTM D3955-20 - Standard Specification for Electrical Insulating Varnishes
• Effective Date: 01-Jan-2012

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D5637 − 05 (Reapproved 2012)
Standard Test Method for
1
Moisture Resistance of Electrical Insulating Varnishes
This standard is issued under the fixed designation D5637; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Significance and Use
1.1 This test method covers the mechanical performance of 5.1 This test method is useful for the evaluation of insulat-
electrical insulating varnishes subjected to high humidity ing varnish performance in high humidity exposure.
conditions.
6. Apparatus
1.2 The values stated in SI units are to be regarded as
6.1 Tensile Testing Machine—See Test Method D2519.
standard.
6.2 Test Fixture—See Test Method D2519.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6.3 Exposure Chamber—Achamber capable of maintaining
responsibility of the user of this standard to establish appro-
a minimum of 100 % relative humidity with condensation, at
priate safety and health practices and determine the applica-
30 6 1°C.
bility of regulatory limitations prior to use. See 7.1.
NOTE 2—The exposure chamber described in IEEE 117 has been found
NOTE 1—There is not ISO or IEC equivalent.
suitable.
2. Referenced Documents 7. Safety Precautions
2
2.1 ASTM Standards: 7.1 It is unsafe to use liquid varnish at temperatures above
D2519 Test Method for Bond Strength of Electrical Insulat- the flash point without adequate ventilation, especially if the
ing Varnishes by the Helical Coil Test possibility exists that flames or sparks are present. Store
varnish in sealed containers.
2.2 IEEE Standard:
IEEE 117 Standard Test Procedure for Evaluation of Sys-
8. Test Specimens
tems of Insulating Materials for Randon-WoundAC Elec-
3
tric Machinery 8.1 Prepare a minimum of ten test specimens in accordance
withTestMethodD2519usingawiremutuallyagreeduponby
3. Terminology
interested parties.
3.1 See Test Method D2519.
9. Procedure
4. Summary of Test Method
9.1 Condition half of the test specimens in the exposure
chamber maintaining a minimum of 98 % relative humidity for
4.1 Flexural strength tests are made on varnish-treated
336 61h.
helical coils to determine the force required to break the coil
under specified conditions both before and after exposure to
9.2 Test specimens both conditioned and unconditioned as
high humidity conditions.
described in Test Method D2519 at standard laboratory condi-
tions. If possible, test conditioned specimens in the exposure
chamber. When specimens are not tested in the exposure
1
This test method is under the jurisdiction of ASTM Committee D09 on
chamber, they should be removed one at a time from the
Electrical and Electronic Insulating Materials and is the direct responsibility of
chamber and tested as soon as possible.The time after removal
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
from the chamber and room conditions will pos
...